APA
The fifty-second round table on transport economics P. 2. a. 1., European Conference of Ministers of Transport & European Conference of Ministers of Transport. (1981). Transport and energy. París: European Conference of Ministers of Transport.
Chicago
The fifty-second round table on transport economics Paris 29-30 april 1980, European Conference of Ministers of Transport and European Conference of Ministers of Transport. 1981. Transport and energy. París: European Conference of Ministers of Transport.
Harvard
The fifty-second round table on transport economics P. 2. a. 1., European Conference of Ministers of Transport and European Conference of Ministers of Transport. (1981). Transport and energy. París: European Conference of Ministers of Transport.
MLA
The fifty-second round table on transport economics Paris 29-30 april 1980, European Conference of Ministers of Transport and European Conference of Ministers of Transport. Transport and energy. París: European Conference of Ministers of Transport. 1981.